Reconstructive procedure for unstable radial-sided triangular fibrocartilage complex avulsions.

Area of Science:

• Orthopedic Surgery
• Biomechanics
• Hand and Wrist Anatomy

Background:

• Radial-sided avulsions of the triangular fibrocartilage complex (TFCC) (Palmer 1D) often lead to distal radioulnar joint (DRUJ) instability.
• Treating these TFCC injuries presents a significant clinical challenge, particularly in restoring joint stability.

Purpose of the Study:

• To evaluate an innovative intra-articular reconstruction technique for unstable radial-sided TFCC avulsions.
• To assess the biomechanical efficacy of this reconstruction in restoring DRUJ stability.

Main Methods:

• Ten cadaveric forearm specimens underwent biomechanical testing.
• Displacement of the distal radioulnar joint was measured under varying loads and rotational positions (neutral, pronation, supination).
• Specimens were tested with intact TFCC, after induced Palmer 1D lesions, and post-reconstruction.

Main Results:

• Reconstruction successfully restored distal radioulnar joint (DRUJ) stability, with mean total displacements returning to near-baseline levels across all rotational positions.
• The intra-articular reconstruction significantly reduced DRUJ displacement compared to the induced TFCC tear.
• Forearm pronation and supination motion were preserved post-reconstruction, matching preoperative ranges.

Conclusions:

• The developed intra-articular reconstruction effectively addresses unstable radial-sided TFCC avulsions.
• This technique restores baseline DRUJ stability without compromising essential forearm rotational function.
• It offers a promising solution for TFCC injuries where current methods may limit motion.